1 files changed, 214 insertions, 0 deletions

diff --git a/openbsd-compat/readpassphrase.c b/openbsd-compat/readpassphrase.c
new file mode 100644
index 0000000..dfb3065
--- /dev/null
+++ b/openbsd-compat/readpassphrase.c
@@ -0,0 +1,214 @@
+/*      $OpenBSD: readpassphrase.c,v 1.26 2016/10/18 12:47:18 millert Exp $     */
+
+/*
+ * Copyright (c) 2000-2002, 2007, 2010
+ *      Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+/* OPENBSD ORIGINAL: lib/libc/gen/readpassphrase.c */
+
+#include "openbsd-compat.h"
+
+#ifndef HAVE_READPASSPHRASE
+
+#include <termios.h>
+#include <signal.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <paths.h>
+
+#ifndef _PATH_TTY
+# define _PATH_TTY "/dev/tty"
+#endif
+
+#ifndef TCSASOFT
+/* If we don't have TCSASOFT define it so that ORing it it below is a no-op. */
+# define TCSASOFT 0
+#endif
+
+/* SunOS 4.x which lacks _POSIX_VDISABLE, but has VDISABLE */
+#if !defined(_POSIX_VDISABLE) && defined(VDISABLE)
+#  define _POSIX_VDISABLE       VDISABLE
+#endif
+
+static volatile sig_atomic_t signo[_NSIG];
+
+static void handler(int);
+
+char *
+readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
+{
+        ssize_t nr;
+        int input, output, save_errno, i, need_restart;
+        char ch, *p, *end;
+        struct termios term, oterm;
+        struct sigaction sa, savealrm, saveint, savehup, savequit, saveterm;
+        struct sigaction savetstp, savettin, savettou, savepipe;
+
+        /* I suppose we could alloc on demand in this case (XXX). */
+        if (bufsiz == 0) {
+                errno = EINVAL;
+                return(NULL);
+        }
+
+restart:
+        for (i = 0; i < _NSIG; i++)
+                signo[i] = 0;
+        need_restart = 0;
+        /*
+         * Read and write to /dev/tty if available.  If not, read from
+         * stdin and write to stderr unless a tty is required.
+         */
+        if ((flags & RPP_STDIN) ||
+            (input = output = open(_PATH_TTY, O_RDWR)) == -1) {
+                if (flags & RPP_REQUIRE_TTY) {
+                        errno = ENOTTY;
+                        return(NULL);
+                }
+                input = STDIN_FILENO;
+                output = STDERR_FILENO;
+        }
+
+        /*
+         * Turn off echo if possible.
+         * If we are using a tty but are not the foreground pgrp this will
+         * generate SIGTTOU, so do it *before* installing the signal handlers.
+         */
+        if (input != STDIN_FILENO && tcgetattr(input, &oterm) == 0) {
+                memcpy(&term, &oterm, sizeof(term));
+                if (!(flags & RPP_ECHO_ON))
+                        term.c_lflag &= ~(ECHO | ECHONL);
+#ifdef VSTATUS
+                if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
+                        term.c_cc[VSTATUS] = _POSIX_VDISABLE;
+#endif
+                (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
+        } else {
+                memset(&term, 0, sizeof(term));
+                term.c_lflag |= ECHO;
+                memset(&oterm, 0, sizeof(oterm));
+                oterm.c_lflag |= ECHO;
+        }
+
+        /*
+         * Catch signals that would otherwise cause the user to end
+         * up with echo turned off in the shell.  Don't worry about
+         * things like SIGXCPU and SIGVTALRM for now.
+         */
+        sigemptyset(&sa.sa_mask);
+        sa.sa_flags = 0;                /* don't restart system calls */
+        sa.sa_handler = handler;
+        (void)sigaction(SIGALRM, &sa, &savealrm);
+        (void)sigaction(SIGHUP, &sa, &savehup);
+        (void)sigaction(SIGINT, &sa, &saveint);
+        (void)sigaction(SIGPIPE, &sa, &savepipe);
+        (void)sigaction(SIGQUIT, &sa, &savequit);
+        (void)sigaction(SIGTERM, &sa, &saveterm);
+        (void)sigaction(SIGTSTP, &sa, &savetstp);
+        (void)sigaction(SIGTTIN, &sa, &savettin);
+        (void)sigaction(SIGTTOU, &sa, &savettou);
+
+        if (!(flags & RPP_STDIN))
+                (void)write(output, prompt, strlen(prompt));
+        end = buf + bufsiz - 1;
+        p = buf;
+        while ((nr = read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r') {
+                if (p < end) {
+                        if ((flags & RPP_SEVENBIT))
+                                ch &= 0x7f;
+                        if (isalpha((unsigned char)ch)) {
+                                if ((flags & RPP_FORCELOWER))
+                                        ch = (char)tolower((unsigned char)ch);
+                                if ((flags & RPP_FORCEUPPER))
+                                        ch = (char)toupper((unsigned char)ch);
+                        }
+                        *p++ = ch;
+                }
+        }
+        *p = '\0';
+        save_errno = errno;
+        if (!(term.c_lflag & ECHO))
+                (void)write(output, "\n", 1);
+
+        /* Restore old terminal settings and signals. */
+        if (memcmp(&term, &oterm, sizeof(term)) != 0) {
+                const int sigttou = signo[SIGTTOU];
+
+                /* Ignore SIGTTOU generated when we are not the fg pgrp. */
+                while (tcsetattr(input, TCSAFLUSH|TCSASOFT, &oterm) == -1 &&
+                    errno == EINTR && !signo[SIGTTOU])
+                        continue;
+                signo[SIGTTOU] = sigttou;
+        }
+        (void)sigaction(SIGALRM, &savealrm, NULL);
+        (void)sigaction(SIGHUP, &savehup, NULL);
+        (void)sigaction(SIGINT, &saveint, NULL);
+        (void)sigaction(SIGQUIT, &savequit, NULL);
+        (void)sigaction(SIGPIPE, &savepipe, NULL);
+        (void)sigaction(SIGTERM, &saveterm, NULL);
+        (void)sigaction(SIGTSTP, &savetstp, NULL);
+        (void)sigaction(SIGTTIN, &savettin, NULL);
+        (void)sigaction(SIGTTOU, &savettou, NULL);
+        if (input != STDIN_FILENO)
+                (void)close(input);
+
+        /*
+         * If we were interrupted by a signal, resend it to ourselves
+         * now that we have restored the signal handlers.
+         */
+        for (i = 0; i < _NSIG; i++) {
+                if (signo[i]) {
+                        kill(getpid(), i);
+                        switch (i) {
+                        case SIGTSTP:
+                        case SIGTTIN:
+                        case SIGTTOU:
+                                need_restart = 1;
+                        }
+                }
+        }
+        if (need_restart)
+                goto restart;
+
+        if (save_errno)
+                errno = save_errno;
+        return(nr == -1 ? NULL : buf);
+}
+
+#if 0
+char *
+getpass(const char *prompt)
+{
+        static char buf[_PASSWORD_LEN + 1];
+
+        return(readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF));
+}
+#endif
+
+static void handler(int s)
+{
+
+        signo[s] = 1;
+}
+#endif /* HAVE_READPASSPHRASE */